NDLI: Molecular diffusion on surface tethered polymer layers: coupling of molecular thermal fluctuation and polymer chain dynamics

Content Provider	Royal Society of Chemistry (RSC)
Author	Wang, Shengqin Zhu, Yingxi
Copyright Year	2010
Abstract	The dynamics of single probe molecules on surface-tethered poly(N-isopropylacrylamide) (PNIPAM) layers is studied by fluorescence correlation spectroscopy. It is surprisingly observed that molecular surface dynamics on polymer layers is much slower than that on surfactant monolayers, despite stronger interfacial interactions for the latter case, suggesting a strong coupling of molecular thermal fluctuation and polymer chain dynamics. The effect of collective dynamics of polymer chains on the surface diffusion of adsorbed molecules is further examined with varied polymer grafting density and thickness. At low grafting density or large brush thickness, the resulting surface inhomogeneity of PNIPAM layers from the respective polymer mushroom conformation and low polymer end-segment density leads to the significant slowing down in the surface diffusion of adsorbed probe molecules. An optimal range in brush thickness to facilitate molecular surface dynamics is observed, where PNIPAM layers adopt the brush conformation with high polymer end-segment density.
Starting Page	4661
Ending Page	4665
Page Count	5
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	6
Issue Number	19
Journal	Soft Matter
DOI	10.1039/c0sm00532k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Poly(N-isopropylacrylamide) Mushroom Polymer Surface diffusion Surfactant Grafting Protein structure Fluorescence correlation spectroscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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